Marissa is conducting an experiment in which she needs to test for acids in water. She is using a substance she believes will turn green when put into different acid solutions. She finds that sometimes the substance turns green but other times it does not. Marissa wants to use this substance in her experiments, but it must consistently turn green in the presence of acid. Which approach should she take to solve her problem?

Which of the following statements is correct in hour our immune system responds to a potential pathogen? a. the adapted immune system will call on the innate immune system to destroy the pathogen. b. b cells will start reading the antigen code immediately and call t cells to assist in destroying the pathogen. c. the skin will be the first line of defense, and then the many phagocytes in the bloodstream will attempt to consume the possible pathogen. d. the t-cells in the adapted immune systems are the first to recognize the pathogen vaccines are weakened forms of disease causing microorganisms, which are given to patients to prevent disease. after the vaccine is administered, the immune system responds by creating a(n) to recognize the a. antigen, antibody b. antibody, antigen c. antibody, antibiotic d. antibiotic, antibody